Hi Kath,
The following are the urls I was taking about:

spondylitis.org vit d thread: http://bbs.spondylitis.org/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=1;t=001735

Dr. Mercola: Test Values and Treatment for Vitamin D Deficiency: http://www.mercola.com/2002/feb/23/vitamin_d_deficiency.htm

My website: http://spondylitis.homestead.com/files/index.htm

Pls let me know if there are any problems accessing the web sites.

Regards,
Krishna

(My website:Lack of exposure to sunlight(UVB?) is the root cause of my ankylosing
spondylitis. Sunlight burnt my ankylosing spondylitis. Sunlight can be
deadly and can cause skin cancer, sun stroke etc.,. Safe limits are different for different people. If you are vit D deficient, don't ignore it!)